4 cups (2 lbs.) prepared fruit
7 cups (3 lbs.) sugar
½ bottle Certo
To prepare fruit, grind about 1 quart fully ripe strawberries, or crush
completely one layer at a time so that each berry is reduced to a pulp.
Slice fine or chop (do not peel) about 1 pound rhubarb. Red-stalked
rhubarb gives best color. Combine fruits. Measure sugar and prepared
fruit into large kettle, filling up last cup with water if necessary.
Mix well and bring to a _full rolling boil_ over hottest fire. Stir
constantly before and while boiling. Boil hard 1 minute. Remove from
fire and stir in Certo. Then stir and skim by turns for just 5 minutes
to cool slightly, to prevent floating fruit. Pour quickly. Paraffin hot
jam at once. Makes about 10 glasses (6 fluid ounces each).